<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi therion people,<div><br></div><div>I’m working on the dataset again with my friend.</div><div><br></div><div>We’ve found that the survex model uses a compass calibration in some places and are trying to work out if this needs transposing across to the therion model.</div><div> But in the process I have found out that when we give therion a compass reading it’s always taking off 0.9 to 1 degree from the reading given in the .th data.</div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);">I’ve just run changes to entrance-boulder in both therion and survex. Below results just for first leg 1-2</span><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);">No date+compass calib= 133.6 deg survex// 132.6 deg therion</span></div><div><span style="background-color: rgba(255, 255, 255, 0);">Date + no compass calib=131.0 deg survex// 130.1 deg therion</span></div><div><span style="background-color: rgba(255, 255, 255, 0);">No date+no compass calib=131 deg survex// 130deg therion</span></div><div><span style="background-color: rgba(255, 255, 255, 0);">Date + compass calib=133.6 deg survex// 132.7 deg therion</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);">So clearly therion is correcting the data 1[] 2[] 13.4[] 131[] 10.0</span></div><div><span style="background-color: rgba(255, 255, 255, 0);">By always taking one degree off the compass irrespective of what we tell it.</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);">(For information: When calibration used survex= *calibrate compass -2.65 // therion= calibrate compass 357.35)</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div>Does anyone have any ideas where therion is pulling this 1 degree correction from?</div><div><br></div><div><br></div><div dir="ltr">Regards,</div><div dir="ltr">Alastair Gott.</div><div dir="ltr"><br>On 26 Feb 2021, at 07:43, A Gott <<a href="mailto:alastairgott@gmail.com">alastairgott@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>HI Tarquin and Andrew,</div><div><br></div><div>Many thanks for that, We were just lost, I think we'll be able to pick it up from here with your helpful guidance. Should just be a case of looking through the .th files and looking for all the 90's</div><div><br></div><div>I hope you are both well.</div><div><br></div><div>Al.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 26 Feb 2021 at 07:33, Andrew Atkinson <<a href="mailto:andrew@wotcc.org.uk">andrew@wotcc.org.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
> DOWN has been mis-converted into +90 rather than -90, when converting<br>
> from Survex format to Therion format.<br>
> Survex:<br>
> 2213 2212 B 3.49 - DOWN<br>
> Therion:<br>
> 2213 2212 3.49 311 90<br>
> I'm guessing that error may turn up elsewhere. consort_climax looks<br>
> similarly wrong.<br>
As a point to note -90 and Down at treated differently for clino <br>
correction, they can be treated ed the same<br>
<br>
From the survex manual<br>
<br>
"*infer plumbs on" tells cavern to interpret gradients of +/- 90 <br>
degrees as UP/DOWN (so it will not apply the clino correction to them). <br>
This is useful when the data has not been converted to have UP and DOWN<br>
<br>
Andrew<br>
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